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A kind of modified crude oil demulsifier and preparation method thereof

A demulsifier and modification technology, which is used in chemical dehydration/demulsification, treatment of hydrocarbon oil, petroleum industry, etc., can solve the problems of secondary pollution, poor environmental friendliness of demulsifier, etc., and achieves neat oil-water interface and strong competition. Adsorption capacity, good effect of use safety

Active Publication Date: 2021-02-12
WUHAN INSTITUTE OF TECHNOLOGY
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

These demulsifiers are poor in environmental friendliness and are likely to cause irreversible secondary pollution; in addition, there are more or less differences in the composition and properties of crude oil production fluids in each oilfield, and there is no demulsifier that can handle all types of crude oil production fluids. emulsion

Method used

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  • A kind of modified crude oil demulsifier and preparation method thereof
  • A kind of modified crude oil demulsifier and preparation method thereof
  • A kind of modified crude oil demulsifier and preparation method thereof

Examples

Experimental program
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Effect test

Embodiment 1

[0054] The preparation of the butyl carboxymethyl chitosan grafted with polyethylene glycol monomethyl ether, concrete steps are as follows:

[0055] (1) Synthesis of epoxidized polyethylene glycol monomethyl ether: get polyethylene glycol monomethyl ether (M n =5000) 5g (1mmol) was dissolved in 50mL of anhydrous toluene, then 50mL of tetrahydrofuran and 0.036g (1.5mmol) of sodium hydride reagent were added, the temperature was raised to 25°C, and the reaction was carried out for 4h. Slowly add 0.37mL (4mmol) epichlorohydrin dropwise into the reaction solution at a temperature of 40°C and react for 6h. The reaction solution was added to 200 mL of diethyl ether, filtered with suction, washed several times with diethyl ether, dried in vacuo, dissolved in 200 mL of dichloromethane, washed with distilled water three times, separated, dried with anhydrous magnesium sulfate, and filtered with suction Distilled under reduced pressure and freeze-dried to obtain epoxidized polyethylen...

Embodiment 2

[0060] The preparation of the hexyl carboxymethyl chitosan grafted with polyethylene glycol monomethyl ether, concrete steps are as follows:

[0061] (1) Synthesis of epoxidized polyethylene glycol monomethyl ether: get polyethylene glycol monomethyl ether (M n =1900) 1.9g (1mmol) was dissolved in 50mL of anhydrous toluene, then 50mL of tetrahydrofuran and 0.036g (1.5mmol) of sodium hydride reagent were added, the temperature was raised to 25°C, and the reaction was carried out for 4h. Slowly add 0.37mL (4mmol) epichlorohydrin dropwise into the reaction solution at a temperature of 40°C and react for 6h. The reaction solution was added to 200 mL of diethyl ether, filtered with suction, washed several times with diethyl ether, dried in vacuo, dissolved in 200 mL of dichloromethane, washed with distilled water three times, separated, dried with anhydrous magnesium sulfate, and filtered with suction Distilled under reduced pressure and freeze-dried to obtain epoxidized polyethyl...

Embodiment 3

[0066] The preparation of the octyl carboxymethyl chitosan grafted with polyethylene glycol monomethyl ether, concrete steps are as follows:

[0067] (1) Synthesis of epoxidized polyethylene glycol monomethyl ether: get polyethylene glycol monomethyl ether (M n =750) 0.75 g (1 mmol) was dissolved in 50 mL of anhydrous toluene, then 50 mL of tetrahydrofuran and 0.036 g (1.5 mmol) of sodium hydride reagent were added, the temperature was raised to 25° C., and the reaction was carried out for 4 h. Slowly add 0.37mL (4mmol) epichlorohydrin dropwise into the reaction solution at a temperature of 40°C and react for 6h. The reaction solution was added to 200 mL of diethyl ether, filtered with suction, washed several times with diethyl ether, dried in vacuo, dissolved in 200 mL of dichloromethane, washed with distilled water three times, separated, dried with anhydrous magnesium sulfate, and filtered with suction Distilled under reduced pressure and freeze-dried to obtain epoxidized ...

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Abstract

The invention relates to a modified crude oil demulsifier and a preparation method thereof. The general structural formula of the demulsifier is shown in formula I, and its preparation method is as follows: 1) carry out epoxidation modification to polyethylene glycol monomethyl ether terminal hydroxyl; 2) modify polyethylene glycol monomethyl ether and Chitosan is reacted to obtain polyethylene glycol monomethyl ether grafted chitosan; 3) the polyethylene glycol monomethyl ether grafted chitosan is modified by alkylation to obtain polyethylene glycol monomethyl ether grafted 4) carry out carboxyalkylation modification to the alkylated chitosan grafted with polyethylene glycol monomethyl ether to obtain alkylated carboxylated chitosan grafted with polyethylene glycol monomethyl ether Alkyl chitosan. The invention uses chitosan natural macromolecular compounds as raw materials, and has the advantages of wide source, natural, non-toxic, good biocompatibility, degradability and the like. By introducing carboxyalkyl groups, alkyl groups and polyether side chains into the molecular chain of chitosan, by controlling the position and degree of substitution of each substituent, a series of high-efficiency breaking agents suitable for oil-in-water (O / W) emulsions can be obtained. emulsion.

Description

technical field [0001] The invention relates to a modified crude oil desalting demulsifier and a preparation method thereof, belonging to the field of petrochemical industry. Background technique [0002] In the process of oilfield exploitation, with the implementation of oil recovery technologies such as steam flooding, surfactant, polymer and ASP flooding, the water content of crude oil emulsion increases, and the stability is enhanced, making it more difficult to break the emulsion of crude oil. The formation of emulsion will bring a series of serious hazards to the exploitation, transportation and processing of petroleum. The emulsification of crude oil and water will make the extraction of crude oil more difficult; when transporting water-containing crude oil by pipeline or tanker truck, it will increase the load of the pump and the transportation cost. Therefore, it is very necessary to desalt and dehydrate the crude oil emulsion before crude oil transportation and pr...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C10G33/04C08G81/00
CPCC08G81/00C10G33/04C10G2300/1033
Inventor 吕仁亮张成梁成王存文徐彩丽覃远航王为国冯魏良徐汶
Owner WUHAN INSTITUTE OF TECHNOLOGY
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